They are not all vertebrates. There are spiders and insects in that kingdom.
They depend on other organisms for food.
They are all made up of more than one cell.
They can all move about on their own.
The Center for Disease Control and Prevention (CDC) procures the use of safer needle devices such as self-stealthing and self-blunting features of syringes (attached are images of said interventions). In using safer needle devices, 80% of needlestick injuries can be reduced.
The statement is true. Digestion of food molecules in the digestive system in the gastrointestinal tract does not require coupling of ATP hydrolysis; but instead requires enzymes that speed up the spontaneous reaction. Enzyme digest specific food substrates at different parts of the digestive system until the final useful products of these enzymatic reactions are absorbed to the body metabolism.
The correct answer is cyanobacteria (ancient cyanobacteria).
The huge concentration of oxygen in the atmosphere is believed to have been initially produced by the actions of ancient cyanobacteria. They are usually observed as symbionts with a number of another group of species, like coral, lichens (fungi), Azolla (pteridophytes), angiosperms, and others.
The atmosphere of oxygen was generated by various cyanobacteria at the time of Proterozoic and Archaean periods.
